hi, currently have a concrete sectional triple garage that I'm removing the fibre concrete asbestos roof and replacing with plastisol coated 0.7mm steel.
I'd like to turn the three garages 8ft door and two 7ft 6" doors into one double and a workshop.
Current roof joists are timber 150 x 47mm on hangers, at 120cm spacing. Each is the width of each garage.
I think from reading building regs, I need 225mm x 47mm at 600mm spacing if I'm to span the width of a double garage, which seems a lot compared with what's there now. But ok if that's what it needs.
But then I got thinking about the lintel over the door and a lintel to span a 4.5m width approx will be huge.
Am I looking at this wrong for what is just a prefab garage? Any recommendations for joist and lintel sizes?
Simon
I'd like to turn the three garages 8ft door and two 7ft 6" doors into one double and a workshop.
Current roof joists are timber 150 x 47mm on hangers, at 120cm spacing. Each is the width of each garage.
I think from reading building regs, I need 225mm x 47mm at 600mm spacing if I'm to span the width of a double garage, which seems a lot compared with what's there now. But ok if that's what it needs.
But then I got thinking about the lintel over the door and a lintel to span a 4.5m width approx will be huge.
Am I looking at this wrong for what is just a prefab garage? Any recommendations for joist and lintel sizes?
Simon